Pull the bottom of the chain downward and forward and try to reseat it on the chainring one tooth forward of where it currently is. If you can do that without the rear mech objecting you’re good.
(You only need one spare chain link for a two tooth increase in chainring)
If the RD looks like this in 50x30, would I be living dangerously by putting on a 52 front without changing the chain?
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